docs: def tag_image(self, repository=None, tag=None):
          """
          Apply additional tags to the image or even add a new name
  
          :param repository: str, see constructor
          :param tag: str, see constructor
          :return: instance of DockerImage
          """
          if not (repository or tag):
              raise ValueError("You need to specify either repository or tag.")
          r = repository or self.name
          t = "latest" if not tag else tag
          self.d.tag(image=self.get_full_name(), repository=r, tag=t)
          return DockerImage(r, tag=t)